Composition of matter for alloy of metals



' oxidizing conditions.

Patented June- 8, 1926,

UNITED STATES PATENT orrlcl- Y RAY I. SPITZLEY AND ALLEN M. THOMPSON, OF DETROIT, MICHIGAN, ASSIGNOBS TO ALLOYS FOUNDRY COMPANY, OF DETROIT, MICHIGAN, A CORPORATION 01' MICHI- GAN.

Nomawing. Original application filed November COMPOSITION OF MATTER FOR ALLOY OF METALS.

15, 1924, Serial No. 750,132. Divided and an. a ucation filed June 2,1925, Serial No. 34,478.

"The alloy herein set forth is a division of the patent'application, filed under the date of.Nov. 15, 1924, hearing the United States Serial Number 750,132, and according to the division required therein.

Our invention relates to a composition of various elements and metals for forming a suitable alloy for making 'non-oxidizable castings, havmg special heat resisting prop erties as may be required for castings constantly exposed to extreme heat and highly Another ob ect 1s to produce an alloy suitable for moulding metal parts ,on steel machined sections, forming complete fusion therewith without distorting or changing't he steel section, the alloy having an extremely high melting point and rapid heat conduction properties making it solidify quickly upon a slight lowering of the temperature, as when coming into contact with cast-in metal parts.

A further object is to produce an alloy having great heat resisting properties, preventing the resulting alloy from any molecu- 'lar change in the metal, either by Warping or change in hardness, when subjected to high heat temperatures.

A still further object is to produce an alloy that will resist oxidization under extreme conditions, even to nearly its fusing point. I

It is common practice in manufacturing castings for gas engine valves, to use an alloy having special heat resisting properties, for the valve cap, casting a machined steel stem therein, by placing the steel stem within the mold before pouring the molten alloy therein, then turning the comoined casting and stemdnto a fimshed steel part. In this construction thealloy cap must be changing the inclosed steel part. Our alloy is'especially adapted for this purpose, and for making valve castings in combination with steel stems, or any other castings in combination with other steel parts, where high heat resisting properties and non-oxidizing cast parts are required, and where a .pre-determined hardness and accuracy in retaining its shape, under changing heat temperatures, are a requisite, and the east portion free from any tendency to warp or scale from the heat. It is known that this alloy is not as efficient in the. power to resist extreme oxidizing conditions, as the formula setforth in the original patent heretofore mentioned, due to the lack of silicon, yet'the alloy has a highly efiicient non-oxidizing I property, offering great resistance to an oxidizing flame. The alloy is capable of being cast in molds, or rolled into sheets, or drawn into bars.

In preparing our alloy we prefer to use the followin elements; nickel, chromium, manganese, 1ron, tungsten and copper, all melted and fused into a mass. The preferred proportions for compounding an alloy having the highest efliciency in non- Nickel Chromium 8 Manganese 7 Iron 14 Tungsten 1 Copper 12 This alloy having a medium hardnesswhich cannot be changed either to a harder of softer metal, and has a meltin g'point be-' tween 3000 degrees and 4000 degrees Fahrenheit, and possesses extremely high heat :conductivity, and which provides for almost instant fusing with any inclosed steel parts placed within a mold and rapidly solidifying of the alloy before changing the inclosed steel section. The heat resisting properties preventing any molecular change therein makes the cast section immune from warping or annealing when subjected to the extreme heat conditions.

without departing from the spirit of our invention, and very good results are produced when varying the proportions of any one or more of the elements therein between the followin limits, also given in percentage by weig 1t:

. Per cent. Nickel from 50 to 59 Chromium from 5 to 10 Manganese from 4 to 12 Iron from 10 to 20 Tungsten from /;to 1- Copper from 8. to 15 The manganese acting as a deoxidizing agent for resisting the scaling and oxidization of the alloy when subjected to extremely high temperatures.

It is obvious that in varying the proportions of any of the elements, a corresponding change in the resulting alloy will be produced, making it possible to. compound cheaper grades of metal if desired.

It is known, and has been determined by these inventors, that in this alloy nickel and cobalt possess very similar properties, and produce practically the same results herein by substituting the cobalt in the place of the nickel, theresulting alloy being a1- 1 most identical in its properties and characteristics, and we, therefore, claim, the right to substitute the element cobalt in the place of the nickel throughout this patent. The metals chromium and tungsten both acting on the hardness of the alloy, and combining with the other elements. in such a manner as to make the resulting composition immune to any molecular change even when subjected to an extremely high temperature.

In certain cases the tungsten may be omitted by increasing the proportions of the chromium. I

It has been determined by successive ex- 'periments that a good grade of commercial of aluminum in the. place of the tungsten in the above formulas, as the hardening agent, although the resulting castings are not as high grade as when the tungsten is used therein.

Having fully described our alloy, what weclaim as our invention, and desire to secure by Letters Patent is:

1. A non-oxidizable alloy adapted for making combination alloy and steel parts, comprising nickel 58 percent, chromium 8 percent," manganese 7 percent, iron 14 percent, tungsten 1 percent, and copper 12 percent.

2. An alloy comprising 58 percent of a metal of the nickel group, 8 percent chromium, 7 percent manganese, 14 percent iron, 1 percent tungsten, and 12 percent copper.-

3. A non-oxidizable, heat resisting alloy comprising elements varied between the following proportions; nickel from 50 to 59 percent, chromium from 5 to 10 percent, manganese from 4 to 12* percent, iron from 10 to 20 percent, tungsten from to 1 percent, and copper from 8 to 15 percent.

4. An alloy comprising 58 percent nickel,

9 percent of metals from the chromium group, 7 percent manganese, 14 percentiron, 12 percent copper.

5. An alloy comprising 58 percent nickel, 9 percent of metal from the chromium group, 7 percentof deoxidizing material, 14 percent iron, and 12. percent copper.

6. An alloy comprlsing 58 percent of metal from the nickel group, 9 percent of iper 12 percent.

In witness whereon we sign these specifications.

- RAY L. SPITZLEY.

. ALLEN M. THOMPSON. 

